"- " 双引号开头为注释
"- 注释可以放在命令行后面
"- 某些命令后面不能有注释

"=========================================================
" #1.执行文件
" :source <filename>
" :so <filename>

" #2.执行当前打开的文件
" :source %
" :so %

" #3.打印变量
" :echo g:animal

" #4.调试时,:执行单条命令

" #5.命令行模式时,函数或控制流会等待输入完成
"===========================================================

let g:animal = "cat"

echo 'I am about to print an animal name' 
echo g:animal
echo 'I just printed the animal name'
